At least 11 more Burmese activists have received jail sentences for taking part in anti-government protests last year, BBC reported.
It brings the total number sentenced this week to more than 60.
A special court set up by the military government handed out jail terms of up to nine-and-a-half years to activists, mainly from the opposition NLD party.
Fourteen student leaders were given 65-year sentences earlier this week and monks and labour activists have also been given long spells in prison.
It is unclear why the authorities have acted against the opposition now.
However, human rights groups say the government is intensifying efforts to curb dissent ahead of elections in 2010.
The exact numbers of those who have been jailed is also unclear as no official figures have been released by the government.
Nyan Win, a spokesman for the National League for Democracy (NLD) which is led by Nobel Peace Prize winner Aung San Suu Kyi, said that on Thursday four monks were each jailed for eight years.
He said that 11 NLD members from Rangoon were jailed for seven-and-a-half years each and another three were given sentences of four to 10 years.